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Papaya Plantings

Retired now in Savannah, but lived in Hawaii all my life. Dried my papaya seeds and then planted them into small startup cups. When they were some 8 inches high, planted them along ide our cottage some 4 ft out. But now noticed something I have never seen before. Each plant is 5 ft apart but I now find small papaya coming up all around the 4 large plantings. Where did they come from?
Stafford-Ames Morse
1 Savannah Sq, Savannah, Ga